Finding the Fourth Proportional to 1,012.10, 1,396.94 and 717.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.10 : 1,396.94 = 717.45 : x
2. Step 2: Convert to fraction form
   1,012.10/1,396.94 = 717.45/x
3. Step 3: Cross multiply
   1,012.10x = 1,396.94 × 717.45
4. Step 4: Simplify right side
   1,012.10x = 1,002,231.02
5. Step 5: Solve for x
   x = 1,002,231.02/1,012.10
6. Step 6: Final answer
   x = 990.25